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C A M B R I A Mr. Steven Shih June 20, 2005 SAMPLING ACTIVITIES AND SAMPLE ANALYSES On March 18, 2005, Paradiso Mechanical, Inc. (Paradiso) of San Leandro, California removed two 15,000 -gallon, double-wall, fiberglass gasoline USTs, four dispensers, and associated product piping. Attachment A presents Cambria's standard procedures for tank, dispenser and piping removal sampling, and excavation sampling. Personnel Present: • Steven Shih, Senior Registered Environmental Health Specialist, SJCEHD • Steve Dalton, Fire Inspector, Stockton Fire Department • Mark Freitas, Construction Foreman, Paradiso • Stewart Dalie, Senior Staff Scientist, Cambria • Ron Barone, Staff Geologist, Cambria Sampling Dates: March 18, April 1, and April 4, 2005. UST, Dispenser, and Product Piping Removal Observations: On March 18, 2005, Cambria field staff observed no cracks or holes in the USTs during tank removal activities. No staining or odors were present in soil beneath the USTs. Cambria field staff also observed the removal of four dispensers and the associated product piping. Staining and odors were observed under the western, northern, and eastern dispensers and product piping. UST Excavation Soil Sampling: On March 18, 2005, Cambria field staff collected six soil samples (TP -1-19 through TP -6-19) from the bottom of the UST excavation at approximately 19 feet below grade (fbg). Figure 3 shows sample locations. Soil samples were collected from the UST excavation using an excavator. The soil was removed from the excavator bucket, packed into clean brass sample tubes, and tube ends were covered with Teflon tape and plastic end caps. Soil samples were labeled, placed into a cooler with ice, entered onto a chain of custody record, and transported to a California -certified analytical laboratory. Dispenser and Product Piping Sampling: On March 18, 2005, Cambria field staff collected 10 soil samples from beneath the former product dispensers (D-1-5 through D-4-5) and piping (P-1-5 through P-4-5, P-6-5, and P-7-5) from native soil at approximately 5 fbg (Figure 3). Soil samples were collected using a backhoe in the manner described above. Over -Excavation Sampling: On April 1 and 4, 2005, Cambria directed lateral and vertical over - exaction in select dispenser and piping locations. Cambria conducted over -excavation in the vicinity of the north and eastern dispensers, including the area between the dispensers. The final extent of over -excavation in the vicinity of these two dispensers was irregularly shaped and approximately 36 feet long by 10.5 feet wide by 12 feet deep. Cambria also conducted over - 2